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Note 13 - Regulatory Assets and Liabilities - Schedule of Regulatory Liabilities (Details) - USD ($)	Dec. 31, 2024	Sep. 30, 2024
Regulatory liabilities	$ 1,671,639	$ 834,278
Regulatory cost of retirement obligations	14,823,044	14,409,847
Regulatory Liability, Noncurrent	19,178,626	19,326,567
Total non-current	34,001,670	33,736,414
Total regulatory liabilities	35,673,309	34,570,692
Rate Refund [Member]
Regulatory liabilities	35,877	37,500
Deferred Income Tax Charge [Member]
Regulatory liabilities	591,764	591,764
Regulatory Liability, Noncurrent	15,320,155	15,468,096
Supplier Refund [Member]
Regulatory liabilities	913,156	30,556
Other Deferred Liabilities [Member]
Regulatory liabilities	130,842	174,458
Other Regulatory Assets (Liabilities) [Member]
Regulatory Liability, Noncurrent	$ 3,858,471	$ 3,858,471

X

- Definition

Regulatory cost of retirement obligations not otherwise included in ARO.

+ References

No definition available.

+ Details

Name:	rgco_RegulatoryCostOfRetirementObligations
Namespace Prefix:	rgco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of regulatory liabilities and asset retirement obligations classified as noncurrent.

+ References

No definition available.

+ Details

Name:	rgco_RegulatoryLiabilitiesAndAssetRetirementObligationsNoncurrent
Namespace Prefix:	rgco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 405
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477571/980-405-25-1

+ Details

Name:	us-gaap_RegulatoryLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount for the individual regulatory current liability as itemized in a table of regulatory current liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 980
-SubTopic 405
-Name Accounting Standards Codification
-Section 25
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477571/980-405-25-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount for the individual regulatory noncurrent liability as itemized in a table of regulatory noncurrent liabilities as of the end of the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(24))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- Details

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- Details

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- Details

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